Operational Cautions; Maintenance And Inspection - Hitachi WH 18DDL Bedienungsanleitung

English
Rotation speed
Use
"Delicate work"
Tightening small
diameter screws (M6 or
similar), etc.
7. Tightening and loosening screws
Install the bit that matches the screw, line up the bit in the grooves of the head
of the screw, then tighten it.
Push the impact driver just enough to keep the bit fitting the head of the
screw.
CAUTION
Applying the impact driver for too long tightens the screw too much and can
break it.
Tightening a screw with the impact driver at an angle to that screw can
damage the head of the screw and the proper force will not be transmitted
to the screw.
Tighten with this impact driver lined up straight with the screw.
8. Tightening and loosening bolts
A hex. socket matching the bolt or nut must first be selected. Then mount
the socket on the anvil, and grip the nut to be tightened with the hex. socket.
Holding the tool in line with the bolt, press the power switch to impact the
nut for several seconds.
If the nut is only loosely fitted to the bolt, the bolt may turn with the nut,
therefore mistaking proper tightening. In this case, stop impact on the nut
and hold the bolt head with a wrench before restarting impact, or manually
tighten the bolt and nut to prevent them slipping.

OPERATIONAL CAUTIONS

1. Resting the unit after continuous work
After use for continuous bolt-tightening work, rest the unit for 15 minutes or
so when replacing the battery. The temperature of the motor, switch, etc.,
will rise if the work is started again immediately after battery replacement,
eventually resulting in burnout.
NOTE
Do not touch the metal parts, as it gets very hot during continuous work.
2. Cautions on use of the speed control switch
This switch has a built-in, electronic circuit which steplessly varies the rotation
speed. Consequently, when the switch trigger is pulled only slightly (low speed
rotation) and the motor is stopped while continuously driving in screws, the
components of the electronic circuit parts may overheat and be damaged.
3. Use a tightening time suitable for the screw
The appropriate torque for a screw differs according to the material and size of
the screw, and the material being screwed etc., so please use a tightening time
suitable for the screw. In particular, if a long tightening time is used in the case of
screws smaller than M8, there is a danger of the screw breaking, so please
confirm the tightening time and the tightening torque beforehand.
4. Work at a tightening torque suitable for the bolt under impact
The optimum tightening torque for nuts or bolts differs with material and
size of the nuts or bolts. An excessively large tightening torque for a small
bolt may stretch or break the bolt. The tightening torque increases in
proportion to the operaton time. Use the correct operating time for the bolt.
5. Holding the tool
Hold the tool firmly with both hands. In this case hold the tool in line with
the screw or bolt.
It is not necessary to push the tool very hard. Hold the tool with a force just
sufficient to counteract the impact force.
13
Examples of tightening mode selector function settings
Low Medium
900 min -1
"Light load work"
Affixing plasterboard etc.
High
2200 min -1
"Heavy load work"
Tightening long screws,
coach screws, bolts, etc.
6. Confirm the tightening torque
The following factors contribute to a reduction of the tightening torque. So
confirm the actual tightening torque needed by screwing up some bolts
before the job with a hand torque wrench. Factors affecting the tightening
torque are as follows.
(1) Voltage
When the discharge margin is reached, voltage decreases and tightening
torque is lowered.
(2) Operating time
The tightening torque increases when the operating time increases. But the
tightening torque does not increase above a certain value even if the tool is
driven for a long time.
(3) Diameter of bolt
The tightening torque differs with the diameter of the bolt. Generally a larger
diameter bolt requires larger tightening torque.
(4) Tightening conditions
The tightening torque differs according to the torque ratio; class, and length
of bolts even when bolts with the same size threads are used. The tightening
torque also differs according to the condition of the surface of workpiece
through which the bolts are to be tightened. When the bolt and nut turn
together, torque is greatly reduced.
(5) Tightening torque varies, depending on the battery's charge level.

MAINTENANCE AND INSPECTION

1. Inspecting the driver bit
Using a broken bit or one with a worn out tip is dangerous because the bit
can slip. Replace it.
2. Inspecting the mounting screws
Regularly inspect all mounting screws and ensure that they are properly
tightened. Should any of the screws be loose, retighten them immediately.
Failure to do so may result in serious hazard.
3. Maintenance of the motor
The motor unit winding is the very "heart" of the power tool.
Exercise due care to ensure the winding does not become damaged and/or
wet with oil or water.
4. Cleaning of the outside
When the impact driver is stained, wipe with a soft dry cloth or a cloth
moistened with soapy water. Do not use chloric solvents, gasoline or paint
thinner, as they melt plastics.
5. Storage
Store the impact driver in a place in which the temperature is less than 40°C,
and out of reach of children.
NOTE
Make sure that the battery is fully charged when stored for a long period (3
months or more). The battery with smaller capacity may not be able to be
charged when used, if stored for a long period.
NOTE
Storing lithium-ion batteries
Make sure the lithium-ion batteries have been fully charged before storing
them.
Prolonged storage of batteries with a low charge may result in performance
deterioration, significantly reducing battery usage time or rendering the
batteries incapable of holding a charge.
S mode
-1
3000 min 3000 min
-1
/3100 min /3100 min
Self drilling screw tightening
-1
-1